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Subject: Veterinary Public Health × Author: Baruah, Aditya × Start date: 2015 ×
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    ThesisItemOpen Access
    Circulation of Japanese Encephalitis virus in mosquito vectors, amplifying hosts and its association with human incidences in Assam
    (College of Veterinary Science, Assam Agricultural University, Khanapara Campus, 2022) Baruah, Aditya; Hussain, P
    Japanese encephalitis (JE) is a re-emerging mosquito-borne flaviviral zoonotic disease and a major cause for concern to childhood mortality and morbidity in countries of Southeast Asia including India. The disease has appeared in sporadic as well as epidemic forms since 1976 in Assam. The present study was envisaged to study the sero-prevalence of JE in pigs, the density pattern of mosquito vectors in JE endemic localities and to draw an association between the occurrence of JE in humans with serological studies in pigs and mosquito density. A total of 200 blood samples of pigs were collected during the study period (June-September, 2021) from Lakhimpur district of Assam. Out of these screened samples, 19% were found positive for antibodies against JEV. The sero-prevalence in different months was observed to be: June (16%), July (28%), August (20%) and September (12%). Sero-prevalence in Urban areas and Peri-Urban areas was observed to be 17.5% and 20%, respectively. The sero positivity in pigs based on their rearing practice in study area was recorded highest in Semi Intensive (25%) followed by intensive (17.5%), tethering (13.33%) and least in scavenging (10%). The rearing of other animals like ducks, poultry had significant relationship on JE seropositivity in pigs. The presence of stagnant water, water tanks, paddy field in the proximity of the pig farms showed higher sero-positivity (p<0.01). A total of 8 different species of mosquitoes were identified of which the most predominant was recorded to be Culex tritaeniorhynchus (26.58%) followed by Mansonia spp. (15.93%), Cule x vishnuix vishnuix vishnuix vishnui x vishnui (15.43%), Culex quinquefasciatus (14.67), Culex gelidus (10.60%), Culex fuscocephala (10.50%), Culex whitmorei (4.01%) and and and Anopheles spp. (2.23%). ). ). 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Culex tritaeniorhynchus and Mansonia spp. A positive correlation was observed between human JE cases and JEV sero-prevalence in pigs of Lakhimpur district of Assam where virus was also found to be circulating amongst the collected mosquito indicating an association between them.